/Engine/Plugins/Animation/IKRig/Source/IKRig/Public/Rig/Solvers/IKRig_FBIKSolver.h
Override to support CHANGING BONE for an existing goal
virtual void SetGoalBone ( const [FName](API\Runtime\Core\UObject\FName) & GoalName, const [FName](API\Runtime\Core\UObject\FName) & NewBoneName )